US, Iran race to define nuke deal; progress would see world powers invited to talks next week

March 18, 2015 9:50 AM

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Iran's Foreign Minister Mohammad Javad Zarif, center, walks away after talks with United States Secretary of State John Kerry in Lausanne, Switzerland, Tuesday March 17, 2015. Top U.S. and Iranian diplomats returned to talks on Tuesday, trying to resolve differences blocking a deal that would curtail Iran's nuclear program and ease sanctions on the country. (AP Photo/Brian Snyder, Pool) (The Associated Press)

LAUSANNE, Switzerland – American and Iranian negotiators raced to fill out a framework for rolling back Iran's nuclear program and punitive U.S. economic sanctions, hoping for enough progress to call in other world powers for the finishing touches on an agreement next week.